Do i have to disconnect battery?

[3.5Max6spd 10+ year member]

you dont HAVE TO, but you SHOULD always disconnect the battery prior to any electrical work

 

[jrz126 10+ year member]

It's not the voltage, it's the amperage...you short yourself out on a "tiny tiny" 12V system, your car battery is going to try to discharge several hundred amps to ground - with you in the way. See if that feels different than touching a 9V battery //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Doesnt ohms law still apply? I=V/R

12 Volts/serveral hundred Kiloohms from hand to hand = a very small current.

As long as you dont put the wires in your mouth...

 

[JimJ 5,000+ posts]

12 Volts/serveral hundred Kiloohms from hand to hand = a very small current.

You make a better conductor than you think //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

It's commonly accepted knowledge that amperages over 1A can kill you if you don't get out of the circuit soon enough. The voltage is simply how big of a shock you get...but the current is what kills you.

 

[Nikuk 5,000+ posts]

You make a better conductor than you think //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
It's commonly accepted knowledge that amperages over 1A can kill you if you don't get out of the circuit soon enough. The voltage is simply how big of a shock you get...but the current is what kills you.

As little as 600 milli-amps IIRC. It's been awhile since I took that training.

-Nick